Projectitis
100 mW
Hi all,
I'm currently designing the steering knuckles for a recumbent with 20" fat wheels. The hubs are 150mm (no dishing - i.e. tyre in center). The outside tire is 550mm diameter (around 21.6").
To get center-point steering with no scrub, I need an inclination of around 20 degrees. I've seen a couple of articles where the "rule of thumb" is around 15 degrees, even up to 18 degrees, but 20 degrees will result in very sluggish steering, though this seems to be "what they say" rather than a hard and fast rule. On my design, 15 degrees would put the kingpin axis around 20mm inside the center (20mm positive scrub).
My question - for a non-performance focused rider, will it generally result in better handling to go with 20 degree kingpin inclination and 0 scrub, or 15 degrees inclination and 20mm of scrub?
Summary:
20 degree kingpin inclination results in 0 scrub
18 degree = ~8mm scrub
15 degree = ~20mm scrub
I'm currently designing the steering knuckles for a recumbent with 20" fat wheels. The hubs are 150mm (no dishing - i.e. tyre in center). The outside tire is 550mm diameter (around 21.6").
To get center-point steering with no scrub, I need an inclination of around 20 degrees. I've seen a couple of articles where the "rule of thumb" is around 15 degrees, even up to 18 degrees, but 20 degrees will result in very sluggish steering, though this seems to be "what they say" rather than a hard and fast rule. On my design, 15 degrees would put the kingpin axis around 20mm inside the center (20mm positive scrub).
My question - for a non-performance focused rider, will it generally result in better handling to go with 20 degree kingpin inclination and 0 scrub, or 15 degrees inclination and 20mm of scrub?
Summary:
20 degree kingpin inclination results in 0 scrub
18 degree = ~8mm scrub
15 degree = ~20mm scrub
